Multifunctional servo liquid level meter

Abstract

The utility model relates to the technical field of servo liquid level meters, and provides a multifunctional servo liquid level meter which comprises a servo mechanism and a main liquid level sensor connected with the servo mechanism through a hub and a connecting cable, and further comprises an auxiliary liquid level sensor which can be arranged on the connecting cable in a sliding mode along the connecting cable, the auxiliary liquid level sensor is located on the side, close to the servo mechanism, of the main liquid level sensor. When the main liquid level sensor is immersed in liquid, the auxiliary liquid level sensor floats on the liquid level to detect the liquid level. And when the main liquid level sensor floats on the liquid level to detect the liquid level, the auxiliary liquid level sensor is jacked up and at least partially separated from the liquid level. According to the multifunctional servo liquid level meter, real-time liquid level safety monitoring and storage tank automatic metering can be achieved only through one liquid level meter, and compared with the prior art, investment is reduced, installation is simpler, and the equipment maintenance amount is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of servo liquid level gauges, in particular to a multifunctional servo liquid level gauge. Background Art

[0002] The servo level gauge is generally driven by a servo mechanism through a soft cable wrapped around the hub to drive a liquid level sensor, such as a buoyancy type or other liquid level sensing component. When the liquid level changes, the information of the liquid level sensor, such as buoyancy or capacitance or other signals, changes, the servo mechanism moves, the hub rotates, and the liquid level sensor moves up and down to reach a new signal balance point and balance on the liquid surface. The distance between the liquid level sensor and the servo mechanism caused by the rotation of the hub changes, and the length of the change is measured by a length measuring mechanism connected to the servo mechanism, such as a rotary encoder or other physical counter. Since the liquid level sensor of the servo level gauge can be multifunctional, in addition to sensing the liquid level, it can also integrate sensors such as temperature, density, and oil-water interface. In this way, in addition to the liquid level measurement function, the servo level gauge can also measure other physical parameters of the liquid at different heights. However, when measuring other physical parameters, the liquid level sensor is immersed in the liquid at various heights for measurement under the action of gravity after being released by the servo mechanism. When the servo level meter measures other parameters besides the liquid level, the liquid level sensor must drop below the liquid level, and the servo level meter cannot detect the liquid level in real time. Moreover, when the servo mechanism drives the liquid level sensor to drop into the liquid to measure other parameters for a long time, if the liquid level changes at this time, it is easy to cause safety accidents such as tank overflow or emptying. Therefore, if the current servo level meter is to measure other parameters in the liquid, it cannot be used as a safety interlocked liquid level device.

[0003] However, the liquid level gauges used to monitor storage tanks are now required to measure the liquid level in real time. Therefore, the existing multifunctional servo liquid level gauge cannot be used as a safety interlock liquid level gauge and can only be used as a metering device. This limits the scope of use of the multifunctional liquid level gauge. If users want to achieve liquid level safety monitoring and automatic tank metering, they must install two such liquid level gauges, one for safety monitoring and the other for automatic tank metering. This brings about disadvantages such as increased investment, complex installation, and increased equipment maintenance. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is that in the prior art, if users want to realize liquid level safety monitoring and automatic tank metering, they must install two liquid level meters, which brings about disadvantages such as increased investment, complex installation, and increased equipment maintenance, thereby providing a multifunctional servo liquid level meter.

[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0006] The utility model provides a multifunctional servo liquid level gauge, comprising a servo mechanism and a main liquid level sensor connected to the servo mechanism through a wheel hub and a connecting cable, and also comprising: an auxiliary liquid level sensor, which can be slidably arranged on the connecting cable along the connecting cable, and the auxiliary liquid level sensor is located on a side of the main liquid level sensor close to the servo mechanism; wherein, when the main liquid level sensor is immersed in liquid, the auxiliary liquid level sensor floats on the liquid surface to detect the liquid level; when the main liquid level sensor floats on the liquid surface to detect the liquid level, the auxiliary liquid level sensor is pushed up and at least partially separated from the liquid surface.

[0007] Furthermore, the auxiliary liquid level sensor is provided with a through hole, and the connecting rope passes through the auxiliary liquid level sensor through the through hole.

[0008] Furthermore, the auxiliary liquid level sensor is a circular structure, and the through hole is located at the center of the circular structure.

[0009] Furthermore, the connecting rope is a steel wire or a coding tape.

[0010] Furthermore, a distance measuring component is provided inside the auxiliary liquid level sensor, which is used to measure the distance H2 between the auxiliary liquid level sensor and the main liquid level sensor; the distance measuring component is electrically connected to the servo mechanism to feed back the H2 to the servo mechanism; when the main liquid level sensor is immersed in the liquid and the auxiliary liquid level sensor floats on the liquid surface, the servo mechanism obtains the distance between it and the main liquid level sensor as H1; then, the actual liquid level height is H1-H2.

[0011] Further, the distance measuring component includes a first rotating wheel, a second rotating wheel, a toothed conveyor belt and a rotary encoder; the first rotating wheel is arranged tangent to the outer ring of the second rotating wheel, the toothed conveyor belt is wrapped around the outer ring of the first rotating wheel and the second rotating wheel, and the tooth surface of the toothed conveyor belt is facing away from the first rotating wheel and the second rotating wheel; a plurality of through holes are arranged at intervals on the connecting rope, and the through holes are meshed with the teeth on the toothed conveyor belt, and when the connecting rope moves relative to the auxiliary liquid level sensor, it drives the first rotating wheel and the second rotating wheel to rotate through the toothed conveyor belt; the rotary encoder is adapted to be arranged on the first rotating wheel or the second rotating wheel, and is used to record the number of rotations of the first rotating wheel or the second rotating wheel, so as to obtain the distance H2 between the auxiliary liquid level sensor and the main liquid level sensor.

[0012] Furthermore, a power supply battery is provided inside the auxiliary liquid level sensor, and the battery is a disposable battery or a rechargeable battery.

[0013] Furthermore, when the battery is a rechargeable battery: the battery is connected to an external power source via a wire located in the connecting cable.

[0014] Furthermore, when the battery is a rechargeable battery: the battery is charged through the main liquid level sensor using the wireless charging principle.

[0015] Furthermore, the temperature of other spaces in the tank to be tested is Tg; the temperature of the liquid in the tank to be tested is Tl; the temperature expansion coefficient of the connecting rope is λ; the tensile expansion coefficient of the connecting rope caused by the gravity of the main liquid level sensor is Ψ; the density of the liquid in the tank to be tested is ρ; the volume of the main liquid level sensor is V; then the actual liquid level after compensation is H1(1+Tg*λ+Ψ*ρ*V)-H2(1+Tl*λ).

[0016] The technical solution of the utility model has the following advantages:

[0017] The multifunctional servo level gauge provided by the utility model is provided with an auxiliary liquid level sensor that can slide along the connecting rope, and because the auxiliary liquid level sensor is located on the side of the main liquid level sensor close to the servo mechanism; when the main liquid level sensor is immersed in the liquid to measure other physical parameters of the liquid at different heights, the auxiliary liquid level sensor floats on the liquid surface to detect the liquid level; when the main liquid level sensor floats on the liquid surface to detect the liquid level, the auxiliary liquid level sensor is subjected to the force of the main liquid level sensor and moves upward along the connecting rope until at least partially detaches from the liquid surface. With such an arrangement, only one liquid level gauge is needed to realize real-time liquid level safety monitoring and automatic tank metering. Compared with the existing technology, the investment is reduced, the installation is simpler, and the equipment maintenance is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of a multifunctional servo liquid level meter (when the main liquid level sensor monitors the liquid level) in one embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of a multifunctional servo liquid level meter (when the auxiliary liquid level sensor monitors the liquid level) in one embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of a connecting cable in a multifunctional servo level gauge in one embodiment of the utility model;

[0022] Figure 4 It is a schematic diagram of an auxiliary liquid level sensor in a multifunctional servo liquid level meter in one embodiment of the utility model.

[0023] 1. Servo mechanism; 2. Hub; 3. Connecting rope; 4. Auxiliary liquid level sensor; 5. Main liquid level sensor; 6. Through hole; 7. First rotating wheel; 8. Second rotating wheel; 9. Toothed conveyor belt; 10. Rotary encoder. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1 , Figure 2As shown, this embodiment provides a multifunctional servo level gauge, including a servo mechanism 1 and a main liquid level sensor 5 connected to the servo mechanism 1 through a hub 2 and a connecting cable 3. In use, the servo mechanism 1 can drive the hub 2 to rotate to tighten or release the connecting cable 3, thereby driving the main liquid level sensor 5 to perform lifting and lowering movements. For example, the servo mechanism 1 can be a servo motor, and a controller can also be arranged inside the motor. For example, the main liquid level sensor 5 can adopt an existing multifunctional sensor, which can integrate functions such as temperature, density, and oil-water interface in addition to sensing the liquid level. The multifunctional servo level gauge also includes: an auxiliary liquid level sensor 4, which can be slidably arranged on the connecting cable 3 along the connecting cable 3, and the auxiliary liquid level sensor 4 is located on the side of the main liquid level sensor 5 close to the servo mechanism 1; wherein, when the main liquid level sensor 5 is immersed in the liquid, the auxiliary liquid level sensor 4 floats on the liquid surface to detect the liquid level; when the main liquid level sensor 5 floats on the liquid surface to detect the liquid level, the auxiliary liquid level sensor 4 is lifted up and at least partially separated from the liquid surface. Among them, for example, the volume of the auxiliary liquid level sensor is relatively small. When the main liquid level sensor performs liquid level monitoring, the auxiliary liquid level sensor will be pushed up and completely separated from the liquid surface. At this time, the auxiliary liquid level sensor stops liquid level monitoring. For example, the volume of the auxiliary liquid level sensor is relatively large. When the main liquid level sensor performs liquid level monitoring, the auxiliary liquid level sensor may not be completely separated from the liquid surface when it is pushed up. At this time, the auxiliary liquid level sensor will also stop liquid level monitoring. The specific implementation method can be realized by a circuit with a selection function, so that the main liquid level sensor has a higher priority than the auxiliary liquid level sensor for monitoring the liquid level, that is, when the main liquid level sensor monitors the liquid level, the auxiliary liquid level sensor stops working. For example, the auxiliary liquid level sensor 4 can be a sensor that can sense the liquid level, and functions such as temperature, density, and oil-water interface may not be integrated, which is conducive to reducing the cost of the multifunctional servo level meter. For example, the manufacturing can use a material with a lower density to prepare the auxiliary liquid level sensor 4, so that the overall density of the auxiliary liquid level sensor 4 is less than the density of the liquid in the tank to be measured, so that it can float on the liquid surface in a natural state.

[0029] The multifunctional servo level gauge provided in this embodiment is provided with an auxiliary liquid level sensor 4 that can slide along the connecting rope 3, and because the auxiliary liquid level sensor 4 is located on the side of the main liquid level sensor 5 close to the servo mechanism 1; when the main liquid level sensor 5 is immersed in the liquid to measure other physical parameters of the liquid at different heights, the auxiliary liquid level sensor 4 floats on the liquid surface to detect the liquid level; when the main liquid level sensor 5 floats on the liquid surface to detect the liquid level, the auxiliary liquid level sensor 4 is subjected to the force of the main liquid level sensor 5 and moves upward along the connecting rope 3 until at least partially detaches from the liquid surface. With such a configuration, only one level gauge is needed to realize real-time liquid level safety monitoring and automatic tank metering. Compared with the prior art, the investment is reduced, the installation is simpler, and the equipment maintenance is reduced.

[0030] Among them, a through hole is provided on the auxiliary liquid level sensor 4, and the connecting rope 3 passes through the auxiliary liquid level sensor 4 through the hole. Preferably, the auxiliary liquid level sensor 4 is a circular structure, and the through hole is located at the center of the circular structure. Such a configuration can prevent the auxiliary liquid level sensor 4 from being eccentric. When the main liquid level sensor 5 pushes the auxiliary liquid level sensor 4 upward, the force acting on the auxiliary liquid level sensor 4 can be made more uniform, so as to avoid a part of the auxiliary liquid level sensor 4 still contacting the liquid surface when the main liquid level sensor 5 floats on the liquid surface.

[0031] Wherein, the connecting rope 3 is a steel wire or a coding ruler tape. Of course, the connecting rope 3 can also be replaced by other flexible cables.

[0032] Among them, a distance measuring component is arranged inside the auxiliary liquid level sensor 4, which is used to measure the distance H2 between the auxiliary liquid level sensor 4 and the main liquid level sensor 5; the distance measuring component is electrically connected to the servo mechanism 1 to feed back H2 to the servo mechanism 1; for example, the distance measuring component can be a rangefinder, and a processor can be arranged inside the rangefinder, and the processor can communicate with the servo mechanism 1 through wired or wireless communication to feed back H2 to the servo mechanism 1 through the built-in processor. When the main liquid level sensor 5 is immersed in the liquid and the auxiliary liquid level sensor 4 floats on the liquid surface, the servo mechanism 1 obtains the distance between it and the main liquid level sensor 5 as H1; then, the actual liquid level height is H1-H2. For example, the servo mechanism 1 can obtain H1 according to the retracted and extended length of the connecting rope 3, for example, the controller inside the servo mechanism 1 can perform data processing and analysis, and take the difference between H1 and H2 as the actual liquid level height.

[0033] like Figure 3 , Figure 4As shown, the distance measuring component includes a first rotating wheel 7, a second rotating wheel 8, a toothed conveyor belt 9 and a rotary encoder 10; the first rotating wheel 7 and the second rotating wheel 8 are arranged tangentially to the outer rings, the toothed conveyor belt 9 is wrapped around the outer rings of the first rotating wheel 7 and the second rotating wheel 8, and the tooth surface of the toothed conveyor belt 9 is opposite to the first rotating wheel 7 and the second rotating wheel 8; a plurality of through holes 6 are arranged at intervals on the connecting rope 3, the interval between two adjacent through holes 6 is equal to the interval between two adjacent teeth on the toothed conveyor belt 9, the through holes 6 are meshed with the teeth on the toothed conveyor belt 9, and when the connecting rope 3 moves relative to the auxiliary liquid level sensor 4, the toothed conveyor belt 9 drives the first rotating wheel 7 and the second rotating wheel 8 to rotate; the rotary encoder 10 is adapted to be arranged on the first rotating wheel 7 or the second rotating wheel 8, and is used to record the number of revolutions of the first rotating wheel 7 or the second rotating wheel 8, so as to obtain the distance H2 between the auxiliary liquid level sensor 4 and the main liquid level sensor 5. For example, the first rotating wheel 7 and the second rotating wheel 8 may be gears or rollers, both of which are rotatably mounted inside the auxiliary liquid level sensor 4 through bearings and rotating shafts. For example, the rotary encoder 10 and the controller inside the servo mechanism 1 may be connected by signal, and the rotary encoder 10 may feed back the measured number of rotations of the first rotating wheel 7 and the second rotating wheel 8 to the controller, and the controller may obtain the length of the movement of the connecting cable 3 corresponding to the number of rotations of the first rotating wheel 7 or the second rotating wheel 8 after analysis and processing, thereby obtaining the distance H2 between the auxiliary liquid level sensor 4 and the main liquid level sensor 5.

[0034] Among them, when the auxiliary liquid level sensor 4 and the servo motor adopt wireless communication, it can adopt the timed wake-up mode to communicate with the controller of the servo mechanism 1 and receive various instructions sent by the servo mechanism 1, including entering the working mode, entering the sleep mode, measuring the liquid level meter, etc.

[0035] When the main liquid level sensor 5 floats on the liquid surface, H2 is 0, and the distance between the servo mechanism 1 and the main liquid level sensor 5 is H1, which is the actual liquid level height.

[0036] The auxiliary liquid level sensor 4 is internally provided with a battery for supplying power to the distance measuring component, and the battery is a disposable battery or a rechargeable battery.

[0037] For example, when the battery is a rechargeable battery: the battery is connected to an external power source via a wire located in the connecting cable 3 .

[0038] For example, when the battery is a rechargeable battery: the battery is charged through the main liquid level sensor 5 using the wireless charging principle.

[0039] Among them, considering the influence of some external factors on the measurement results, in order to improve the measurement accuracy, the formula for calculating the liquid level height can be compensated. For example, the temperature of other spaces in the tank to be measured is Tg; the temperature of the liquid in the tank to be measured is Tl; the temperature expansion coefficient of the connecting rope 3 is λ; the tension expansion coefficient of the connecting rope 3 caused by the gravity of the main liquid level sensor 5 is Ψ; the density of the liquid in the tank to be measured is ρ; the volume of the main liquid level sensor 5 is V; then the actual liquid level after compensation is H1(1+Tg*λ+Ψ*ρ*V)-H2(1+Tl*λ).

[0040] In summary, the multifunctional servo liquid level gauge in the present application adds an auxiliary liquid level sensor. When the main liquid level sensor 5 drops into the liquid, the auxiliary liquid level sensor 4 floats on the liquid surface due to the buoyancy, and is restricted by the connecting rope 3 connecting the main liquid level sensor 5 and the servo mechanism 1. It can only float directly above the main liquid level sensor 5. The auxiliary liquid level sensor 4 measures the distance between itself and the main liquid level sensor 5, and sends it to the controller of the servo mechanism 1 wirelessly or wired. The controller calculates the actual liquid level height according to the position of the main liquid level sensor 5 and the distance between the auxiliary liquid level sensor 4 and the main liquid level sensor 5. In this way, when the main liquid level sensor 5 cannot measure the liquid level, the auxiliary liquid level sensor 4 is relied on to sense the liquid level change, thereby solving the problem that the servo liquid level gauge cannot measure the liquid level in real time.

[0041] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A multifunctional servo level gauge, comprising a servo mechanism (1) and a main liquid level sensor (5) connected to the servo mechanism (1) via a hub (2) and a connecting cable (3), characterized in that: Also includes: an auxiliary liquid level sensor (4) which is slidably arranged on the connecting cable (3) along the connecting cable (3), and the auxiliary liquid level sensor (4) is located on a side of the main liquid level sensor (5) close to the servo mechanism (1); When the main liquid level sensor (5) is immersed in the liquid, the auxiliary liquid level sensor (4) floats on the liquid surface to detect the liquid level; when the main liquid level sensor (5) floats on the liquid surface to detect the liquid level, the auxiliary liquid level sensor (4) is lifted up and at least partially separated from the liquid surface.

2. The multifunctional servo level gauge according to claim 1, characterized in that: The auxiliary liquid level sensor (4) is provided with a through hole, and the connecting rope (3) passes through the auxiliary liquid level sensor (4) through the through hole.

3. The multifunctional servo level gauge according to claim 2, characterized in that: The auxiliary liquid level sensor (4) is a circular structure, and the through hole is located at the center of the circular structure.

4. The multifunctional servo level gauge according to claim 2, characterized in that: The connecting rope (3) is a steel wire or a coding tape.

5. The multifunctional servo level gauge according to claim 1, characterized in that: A distance measuring component is provided inside the auxiliary liquid level sensor (4) for measuring the distance H2 between the auxiliary liquid level sensor (4) and the main liquid level sensor (5); The distance measuring component is electrically connected to the servo mechanism (1) to feed back the H2 to the servo mechanism (1); When the main liquid level sensor (5) is immersed in the liquid and the auxiliary liquid level sensor (4) floats on the liquid surface, the servo mechanism (1) obtains a distance H1 between itself and the main liquid level sensor (5); Then, the actual liquid level height is H1-H2.

6. The multifunctional servo level gauge according to claim 5, characterized in that: The distance measuring component comprises a first rotating wheel (7), a second rotating wheel (8), a toothed conveyor belt (9) and a rotary encoder (10); The first rotating wheel (7) and the second rotating wheel (8) are arranged tangentially to their outer rings, the toothed conveyor belt (9) is wound around the outer rings of the first rotating wheel (7) and the second rotating wheel (8), and the tooth surface of the toothed conveyor belt (9) faces away from the first rotating wheel (7) and the second rotating wheel (8); The connecting rope (3) is provided with a plurality of through holes (6) at intervals, and the through holes (6) mesh with the teeth on the toothed conveyor belt (9). When the connecting rope (3) moves relative to the auxiliary liquid level sensor (4), the first rotating wheel (7) and the second rotating wheel (8) are driven to rotate through the toothed conveyor belt (9); The rotary encoder (10) is adapted to be arranged on the first rotating wheel (7) or the second rotating wheel (8) and is used to record the number of revolutions of the first rotating wheel (7) or the second rotating wheel (8), thereby obtaining the distance H2 between the auxiliary liquid level sensor (4) and the main liquid level sensor (5).

7. The multifunctional servo level gauge according to claim 5, characterized in that: A power supply battery is arranged inside the auxiliary liquid level sensor (4), and the battery is a disposable battery or a rechargeable battery.

8. The multifunctional servo level gauge according to claim 7, characterized in that: When the battery is a rechargeable battery: The battery is connected to an external power source via a wire located in the connecting cable (3).

9. The multifunctional servo level gauge according to claim 7, characterized in that: When the battery is a rechargeable battery: The battery is charged via the main liquid level sensor (5) using the wireless charging principle.

10. The multifunctional servo level gauge according to claim 5, characterized in that: The temperature of other spaces in the tank to be tested is Tg; The temperature of the liquid in the tank to be tested is Tl; The temperature expansion coefficient of the connecting cable (3) is λ; The tensile expansion coefficient of the connecting rope (3) caused by the gravity of the main liquid level sensor (5) is Ψ; The density of the liquid in the tank to be tested is ρ; The volume of the main liquid level sensor (5) is V; The actual liquid level after compensation is H1(1+Tg*λ+Ψ*ρ*V)-H2(1+Tl*λ).

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